Half to asa lyman harris



(No Model.) A

S. D. HARRIS.

AUTOMAT FEED FOR ROCK DRILLS.

No. 366,581. Patented July 12, 1887.

FIB!

oaf/y /me/ Mga@ WWA/5655 N PETERS. FMlvLhogmpher, Washinginn. D. C.

UNITED' STATES PATENT OEEICE.

SULLIVAN DWIGHT HARRIS, OF ATLANTA, GEORGIA, ASSIGNOR OF ONE- HALF TO ASA LYMAN HARRIS, OF SAME PLACE.

AUTOMATIC FEED FOR ROCK-DRILLS.

SPECIFICATIN forming part of Letters Patent No, 366,581, dated Juiy 12,1887,

Application filed A] ril 5, 18H7.

V Io reciprocate the pistons of an engine to which the drills are attached. The cylinders of these drills are arranged upon frames or supports,v

and are capable of being fed forward by turning a screw as the tool ents its way into the I rock. The-feeding is ordinarily done by hand, and is very irregular, besides the full torce of the stroke of the piston is seldom given, as it depends upon the position of the cylinder at the time when the tool strikes the rock. This 2o method of feeding requires a constant attendance of a man to each drill.

The object of my invention is to provide a rock-drill with an automatic feed, and one in which the machine is only fed as fast as the material is cut, and also to provide means Vfor stopping the operation of the drill when a pre determined depth of hole is reached. I at tain these objects by devices illustrated in the accompanying drawings, in which- Figure l is a sectional view showing the manner ot`.operating the feed-rod. Fig. 2 is a side elevation showing the feedrod, pawl and carrier, and feed-screw. Fig. 3 is a modification. Fig. 4 is a view showing the top of feedscrew, pawl, and carrier; and Fig. 5 shows the means for stopping the drill.

A is the cylinder, the ports and valves being omitted, as they form no part of nor do they assist in illustrating my invention.

Bis the piston with the usual piston-rod, and G is the cylinder-head provided with a stufng-box for the piston-rod. Projecting into t-he cylinder through the head is a rod, D, and through the outer flange of the head is a rod, e. These rods are held on theirlower ends rigidly together by the bar d.

Between the upper side of the flange and a head or collar on the rod e is placed a spring, f. This spring keeps the end of rod D pro- Serial No. 233,603. (No model.)

jecti ng a short distance intothe cylinder, and 5o upon which the piston will strike before it strikes the head of the cylinder. To the rod c is attached the connecting-rod g, which in its turn is connected to a bellerank, Z, that is pivoted to the side of the cylinder. The b ellcrank has slots in each end.

Secured to or cast with the upper end of the cylinder is the support E for the feed-screw 7L and ratchetwhcel o. On one side of this support are formed guides r1', in which the carrier m for the pawl a reciprocates by means ofthe bell-crank Z. The pawl is kept in contact with the ratchet-wheel by the spring s.

The operation is as follows: The piston, by the tool cutting into the rock, descends far enough in the cylinder to strike-the rod D, which pulls on the rod g and bell-crank, drawing the carrier back, the pawlengages the next tooth, the piston ascends, and the springf throws the carrier forward andturns the screw. The screw may be positively fed by the piston and the spring return the carrier. To permit the screw to be turned by hand, press the rod g down as Vfar as the springf will permit. This will cause the carrier to Inove the pawl clear of the ratchet-wheel, when the screw may be turned in either direction. To prevent the pawl from turning too far, so that itf would not engage with the ratchet-wheel, I provide the pawl at its back end with a shoulder, y, which engages with the carrier when the pawl is withdrawn from the wheel.

Fig. 3 shows the rod e connected to a collar, d', that is within the cylinder. The springfis also shown in the cylinder between the head and washer. A rubber washer, u, is placed on the washer d to deaden the sound of the blow when the piston strikes the collar. In this form the cylinder is cast with a projection upon its side for the passage of the rod e.

In Fig. 5 the cylinder A is provided with the usual steam-chest, X. To the steam or air supply side there is attached a throttle-valve, c, having a handle, o. To the frame p is secured a bracket, k, through which is placed an adjustable gage rod or stop, w. The opera` tion is as follows: The depth of hole desired to be cut is measured ofi by settingthe end of the gage-rod that distance from the throttlevalve handle e. When the cylinder in its operation is fed forward until the handle Acomes in contact with the gagerod, the drill ceases to work.

It will be readily seen that the automatic feed and stop devices have many advantages over the old method of operating the drills, for one man can attend to a number of drills and each drill Will be Working at its greatest capacity. V

Having fully described my invention, what I desire to claim is l l. In a rock-drill, the combination of the piston with the rod projecting into the cylinden'the spring, and means for turning the feed-screw, substantially as sho-Wn.

2. In a rock-drill, the combination of the piston with the rod projecting into the cylinder through the cylinder-head and connected to a rod that leads to the feed mechanism7 and the other rod,which passes through the liange of the cylinderhead and is provided with a. spring, with a connecting-rod, a bell-crank pivoted to the cylinder, a carrier and pawl, and a feed screw, substantialy as described.

4. The combination of the cylinder with the guides, the carrier, the pawl and spring, the ratchetwheel, and the stop upon the end of the pawl, substantially as described.

5. The combination of the cylinder, provided With the steam-chest and throttle-valve, with the valve-handle and the adjustable stop, substantially asdescribed. v

SULLIVAN DWIGHT HARRIS.

HARRY KRoUsE, CHARLES FECHNER. 

